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RETIREMENT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2019
Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Net Periodic Benefit Cost | The components of net periodic benefit cost for the Company’s defined benefit plans for the three months ended March 31, 2019 and 2018 were as follows (in thousands):
|  | Pension Benefits |
|  | Pension Plan |  |  | SERP |
|  | Three months ended March 31, |  |  | Three months ended March 31, |
Components of net periodic benefit cost: |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Service cost |  | $ | 1,768 |  |  | $ | 2,227 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 4,207 |  |  |  | 3,631 |  |  |  | 13 |  |  |  | 12 |
Expected return on plan assets |  |  | (5,224 | ) |  |  | (5,323 | ) |  |  | — |  |  |  | — |
Amortization of actuarial loss |  |  | 678 |  |  |  | 705 |  |  |  | 7 |  |  |  | 6 |
Net periodic benefit cost |  | $ | 1,429 |  |  | $ | 1,240 |  |  | $ | 20 |  |  | $ | 18 |
Other Postretirement Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Net Periodic Benefit Cost | The components of net periodic benefit cost for the Company’s postretirement benefit plan for the three months ended March 31, 2019 and 2018 were as follows (in thousands):
|  | Other Postretirement Benefits |
|  | Postretirement Welfare Plan |
|  | Three months ended March 31, |
|  | 2019 |  |  | 2018 |
Components of net periodic benefit cost: |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |
Interest cost |  |  | 8 |  |  |  | 6 |
Amortization of actuarial gain |  |  | (135 | ) |  |  | (149 | )
Net periodic benefit cost |  | $ | (127 | ) |  | $ | (143 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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